Mobility Radeon HD 3870 X2 and Mobility Radeon HD 4870 - video card comparison
Mobility Radeon HD 3870 X2
Mobility Radeon HD 4870
Architecture
RV6xx (2007−2010)
Terascale 1 (2008−2010)
GPU code name
M88-XT CF
M98-XT
Market segment
Laptop
Laptop
Release date
September 2008
January 2009
Interface
PCIe 2.0 x16
PCIe 2.0 x16
Core clock speed
660 MHz
550 MHz
Floating-point performance
2x 422.4 gflops
880.0 gflops
Manufacturing process technology
55 nm
55 nm
Number of transistors
666 million
956 million
Pipelines / CUDA cores
640
800
Power consumption (TDP)
110 Watt
-
Texture fill rate
10.56
22.00
Memory type
GDDR3
GDDR5
Maximum RAM amount
512 MB
1 GB
Memory bus width
256 Bit
256 Bit
Memory clock speed
850 MHz
888 MHz
Memory bandwidth
54.4 GB/s
56.83 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
10.1 (10_1)
10.1 (10_1)
OpenCL
N/A
1.1
OpenGL
3.3
3.3
Shader Model
4.1
4.1
Vulkan
N/A
N/A